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| All Patents in class 123/197.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 247,741 | Oct. 04, 1881 | E. Bénier | Gas Engine | gas and gasoline engines | |
| 367,496 | Aug. 02, 1887 | J. Atkinson | Gas Engine | gas and gasoline engines | |